Spiral embossing cutter and embossing machine for preparing annular thread metal sheath

Abstract

The invention relates to the technical field of metal sheath preparation, and aims to solve the technical problems of obvious trace of a cutter connecting position and deformation of a metal sheath. In order to solve the technical problem, the invention provides the spiral embossing cutter and the embossing machine for preparing the annular thread metal sheath. The invention comprises: an embossing knife rest; the spiral embossing knife is mounted on the embossing knife rest; and the inclination angle of the embossing knife rest is adjustable. The spiral embossing cutter comprises a cutter main body; the spiral embossing is arranged in the cutter main body, and the spiral embossing is left-handed; and the thickness of the spiral embossing is 1.25 times of the pitch P of the spiral embossing. Forming is uniform, and deformation of the metal sheath is avoided; head and tail cutter connecting positions are smooth, and the head and the tail can basically coincide well.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal sheath preparation, in particular to a spiral grooving tool for preparing an annular thread metal sheath and a grooving machine. BACKGROUND

[0002] The structure of the cable comprises, from the inside out, a conductor, a conductor shield, insulation, an insulation shield, a wrapping, a metal sheath, and an outer sheath. The wrapping is a semi-conductive buffer water-blocking tape spirally wrapped on the surface of the insulation shield, which plays a water-blocking role.

[0003] The metal sheath is the most common structure in high-voltage cables. The metal sheath is generally made of aluminum and mainly includes corrugated sheaths and smooth sheaths. The corrugated sheaths can be divided into spiral threads and annular threads (referred to as annular threads). The present application mainly relates to the structure of the annular thread sheath. The main advantage of this structure is that the metal sheath has excellent water permeability. Under the same conditions, the annular thread structure of the annular thread sheath forms a relatively independent water-blocking space, effectively blocking the flow of water between the metal sheath and the surface of the insulation core. For the annular thread sheath with a spiral thread structure, water flows along the space formed by the spiral thread structure.

[0004] The spiral thread sheath is rolled by using an annular thread tool, and the annular thread sheath is rolled by using a spiral thread grooving tool.

[0005] Compared with the spiral thread structure, the annular thread sheath is difficult to produce and manufacture, and the technical requirements for the grooving tool for processing the annular thread sheath (i.e., the spiral thread grooving tool) are high. The head and tail of the spiral thread grooving tool should coincide, but in the production process, the existing spiral thread grooving tool does not coincide due to the inclination angle of the tool holder or other factors, thereby causing obvious traces at the joint position, deformation of the metal sheath, and other defects. SUMMARY

[0006] Therefore, the present application aims to overcome the above-mentioned problems in the prior art.

[0007] To solve the above-mentioned technical problems, the present application provides a spiral thread grooving tool for preparing an annular thread metal sheath, comprising:

[0008] a tool body;

[0009] a spiral thread groove arranged in the tool body, and the spiral thread groove is left-handed; and the thickness of the spiral thread groove is 1.25 times the pitch P of the spiral thread groove.

[0010] In an embodiment of the present application, the pitch P of the spiral thread groove is 1.5 mm to 2.5 mm larger than the pitch P1 of the annular thread metal sheath.

[0011] In an embodiment of the present application, the calculation formula of the helix angle α of the annular thread metal sheath is:

[0012] a = arctan (1.25P / L) ;

[0013] Wherein, P is the spiral rolling pitch; L is the length of the spiral rolling.

[0014] The application further provides a rolling machine for preparing the annular threaded metal sheath.

[0015] The rolling cutter holder;

[0016] The spiral rolling cutter in any of the above embodiments is installed on the rolling cutter holder; and the inclination angle of the rolling cutter holder is adjustable.

[0017] In one embodiment of the application, the inclination angle of the rolling cutter holder is 1-1.5° larger than the spiral angle a of the annular threaded metal sheath.

[0018] In one embodiment of the application, the rolling cutter holder is inclined to the left.

[0019] In one embodiment of the application, the rolling pitch P2 of the rolling machine is 3.5-4.5mm smaller than the spiral rolling pitch P.

[0020] In one embodiment of the application, the rolling cutter holder comprises a cutter holder body, a fixing member and an adjusting component; the cutter holder body and the fixing member are movably connected through the adjusting component; the adjusting component comprises a pull rod seat and a connecting member; the pull rod seat is provided with an arc-shaped slot hole; the connecting member is inserted into the arc-shaped slot hole and used for connecting the pull rod seat and the fixing member; and the cutter holder body is connected with the pull rod seat.

[0021] In one embodiment of the application, the adjusting component is two, and the two adjusting components are symmetrically arranged on the two sides of the rolling cutter holder.

[0022] In one embodiment of the application, the outer side of the pull rod seat is provided with a scale.

[0023] The above technical solution of the application has the following advantages compared with the prior art:

[0024] The spiral rolling cutter and the rolling machine for preparing the annular threaded metal sheath can avoid the deformation of the metal sheath, and the head and tail of the product can be basically well overlapped. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the content of the application more easily understood, the application will be further described in detail below according to the specific embodiments of the application and in combination with the drawings, in which:

[0026] Figure 1 is a structure schematic view of a spiral rolling cutter for preparing an annular threaded metal sheath in a preferred embodiment of the application;

[0027] Figure 2 is Figure 1 Figure 1 is a schematic diagram of a part structure of a rolling machine for preparing a ring thread metal sheath;

[0028] Description of the drawings: 100, rolling cutter holder; 110, cutter holder body; 120, fixing part; 130, adjusting part; 131, pull rod seat; 132, connecting part; 133, circular arc slot; 134, scale;

[0029] 200, spiral rolling cutter; 210, cutter body; 220, spiral rolling. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0031] Referring to Figures 1-2 Figure 1, the embodiment of the present application provides a rolling machine for preparing a ring thread metal sheath, comprising

[0032] a rolling cutter holder 100 and a spiral rolling cutter 200, the spiral rolling cutter 200 is installed on the rolling cutter holder 100; the inclination angle of the rolling cutter holder 100 is adjustable;

[0033] The spiral rolling cutter 200 comprises a cutter body 210 and a spiral rolling 220, the spiral rolling 220 is arranged in the cutter body 210, and the spiral rolling 220 is left-handed; the thickness of the spiral rolling 220 is 1.25 times of the pitch P of the spiral rolling 220.

[0034] The present application is simulated and tested, and the parameters of the ring thread metal sheath are as follows: the outer diameter is 116.0±2.0mm, the pitch P1 of the ring thread metal sheath is 30.6±1.0mm, the depth of the spiral rolling 220 is 5.2±0.2mm, and the ring thread metal sheath is right-handed. The parameters of the spiral rolling cutter 200 are as follows: the inner diameter is 120.0mm, and the spiral angle a is 4.9°.

[0035] The simulation and testing process is as follows:

[0036] S1, the direction of the rolling cutter holder 100 is counterclockwise, the rolling cutter holder 100 is left-inclined, the inclination angle of the rolling cutter holder 100 is 2°; the pitch P2 of the rolling machine is 32.3mm (i.e. the pitch P2 of the rolling machine is equal to the pitch P of the spiral rolling 220), the thickness of the spiral rolling cutter 200 is 1.25P, and the spiral rolling cutter 200 is right-handed.

[0037] The conclusion after the test is that: the spiral pattern is formed on the product after rolling, not the ring pattern; therefore, the product does not meet the process requirements.

[0038] S2, the turning direction of the pattern rolling tool holder 100 is counterclockwise, the pattern rolling tool holder 100 is left inclined, the inclination angle of the pattern rolling tool holder 100 is 2°, the pitch P2 of the pattern rolling machine is 32.3mm, the spiral pattern rolling tool 200 is 1.25P, and the spiral pattern rolling tool 200 is left-handed.

[0039] The conclusion after the test is that: the ring pattern is formed on the product after rolling, but the metal sheath is deformed seriously, which does not meet the process requirements.

[0040] S3, the turning direction of the pattern rolling tool holder 100 is counterclockwise, the pattern rolling tool holder 100 is right inclined, the inclination angle of the pattern rolling tool holder 100 is 2°; the pitch P2 of the pattern rolling machine is 32.3mm, the thickness of the spiral pattern rolling tool 200 is 1.25P, and the spiral pattern rolling tool 200 is left-handed.

[0041] The conclusion after the test is that: the metal sheath accumulates in the product, which means that the metal sheath retreats under the action of the pattern rolling tool and accumulates in the inside of the pattern rolling tool, resulting in quality problems, so it cannot be confirmed whether the spiral pattern or the ring pattern is formed on the product.

[0042] In summary, through the tests of S1-S3, it is known that the pattern rolling tool holder 100 is left inclined, and the spiral pattern rolling tool 200 is left-handed.

[0043] S4, the turning direction of the pattern rolling tool holder 100 is counterclockwise, the pattern rolling tool holder 100 is left inclined, the spiral pattern rolling tool 200 is left-handed, the inclination angle of the pattern rolling tool holder 100 is 2°, the thickness of the spiral pattern rolling tool 200 is 1.25P, and the pitch P2 of the pattern rolling machine (27.0mm, 28.2mm, 29.2mm, 32.3mm, 32.8mm, 39.2mm).

[0044] The conclusion after the test is that: the ring pattern is formed on the product after rolling. And there is the following rule: when the pitch P2 of the pattern rolling machine is greater than the pitch P of the spiral pattern rolling 220, the metal sheath is deformed seriously; when the pitch P2 of the pattern rolling machine is less than the pitch P of the spiral pattern rolling 220, the metal sheath deformation is improved, but there are still obvious tool engagement position marks. Therefore, the pitch P2 of the pattern rolling machine should be greater than the pitch P of the spiral pattern rolling 220. And through the test of different pitches P2 of the pattern rolling machine, it can be concluded that the pitch P2 of the pattern rolling machine is 2mm~3mm less than the pitch P of the spiral pattern rolling 220, and the metal sheath deformation improvement effect is best.

[0045] S5, the turning direction of the knurling tool holder 100 is counterclockwise, the knurling tool holder 100 is left inclined, the spiral knurling tool 200 is left-handed, the inclination angle of the knurling tool holder 100 is 2°, the thickness of the spiral knurling tool 200 is 1.25P, the knurling machine pitch P2 is 28.2mm, the inclination angle of the knurling tool holder 100 is changed (0~10°, first test every 1°, and then verify every 0.1° after confirming the better inclination angle).

[0046] The conclusion after the test is that: when the inclination angle of the knurling tool holder 100 is 5.9°, 6.0°, 6.1°, 6.2°, 6.3°, 6.4° (that is, the inclination angle of the knurling tool holder 100 is 1~1.5° larger than the helix angle α of the annular thread metal sheath), the annular thread sheath is formed on the product after rolling, and the annular thread sheath has the best forming effect, and the head and tail can basically coincide well.

[0047] S6, the turning direction of the knurling tool holder 100 is counterclockwise, the knurling tool holder 100 is left inclined, the spiral knurling 220 is left-handed, the inclination angle of the knurling tool holder 100 is 6.2°, the knurling machine pitch P2 is 28.2mm, and the thickness of the spiral knurling tool 200 is changed (1.1P, 1.2P, 1.5P, 2.0P, 3.0P)

[0048] The conclusion after the test is that: it is impossible to produce a qualified annular thread sheath. Therefore, the thickness of the spiral knurling tool 200 is 1.25P.

[0049] Through the above test, it is concluded that the turning direction of the knurling tool holder 100 is counterclockwise, the knurling tool holder 100 is left inclined, the spiral knurling 220 is left-handed, the inclination angle of the knurling tool holder 100 is 6.2°, the thickness of the spiral knurling tool 200 is 1.25P, and the knurling machine pitch P2 is 28.2mm. The pitch of the product produced is 30.6mm, there is no deformation, and the head and tail can basically coincide well.

[0050] During the test process, the actual requirement of the annular thread metal sheath pitch P1 needs to be considered, the spiral knurling tool 200 needs to be designed, and the pitch increase caused by the deflection angle of the knurling tool holder 100 needs to be paid attention to.

[0051] Specifically, through simulation and test, it is known that the spiral knurling 220 is left-handed, and the thickness of the spiral knurling 220 is 1.25 times the pitch P of the spiral knurling 220, which avoids the deformation of the metal sheath, and the head and tail of the product can basically coincide well.

[0052] Further, the pitch P of the spiral knurling 220 is 1.5mm~2.5mm larger than the pitch P1 of the annular thread metal sheath.

[0053] Further, the formula for calculating the helix angle a of the annular thread metal sheath is:

[0054] a = arctan (1.25P / L);

[0055] Wherein, P is the helical thread 220 pitch; L is the length of the helical thread 220 (i.e. the length from the starting point to the end point of the helical thread 220).

[0056] Further, the inclination angle of the texturing tool holder 100 is 1-1.5° larger than the helix angle a of the annular thread metal sheath.

[0057] Further, the texturing tool holder 100 is inclined to the left.

[0058] Further, the texturing machine pitch P2 is 3.5-4.5mm smaller than the helical thread 220 pitch P.

[0059] Further, the texturing tool holder 100 comprises a tool holder body 110, a fixing member 120 and an adjusting component 130; the tool holder body 110 and the fixing member 120 are movably connected through the adjusting component 130; the adjusting component 130 comprises a pull rod seat 131 and a connecting member 132; the pull rod seat 131 is provided with a circular arc slot hole 133; the connecting member 132 is inserted into the circular arc slot hole 133 for connecting the pull rod seat 131 and the fixing member 120; the tool holder body 110 is connected with the pull rod seat 131. In some embodiments, the connecting member 132 adopts a pull pin. In other embodiments, the connecting member 132 adopts a screw.

[0060] Specifically, in the present embodiment, the inclination angle of the texturing tool holder 100 is adjusted by inserting the connecting member 132 into different positions of the circular arc slot hole 133, which is simple in structure and convenient and fast in operation.

[0061] Further, the adjusting component 130 is two, and the two adjusting components 130 are symmetrically arranged on the two sides of the texturing tool holder 100.

[0062] Specifically, the present embodiment adjusts the inclination angle of the texturing tool holder 100 by two adjusting components 130 at the same time, which is more stable in structure.

[0063] Further, the outer side of the pull rod seat 131 is provided with a scale 134.

[0064] Specifically, the present embodiment facilitates real-time grasping of the inclination angle of the texturing tool holder 100 during the adjustment process.

[0065] The metal sheath ring formed by the present application is uniform (without deformation) and smooth at the head-tail joint position.

[0066] Obviously, the above embodiments are merely example for clearly illustrating, and are not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be enumerated, and the obvious changes or variations derived from the above are still within the protection scope of the present application.

Claims

1. A spiral-shaped riveting tool for preparing annular threaded metal sleeves, characterized in that: include: Tool body; A spiral groove is provided in the tool body, and the spiral groove is left-handed; The thickness of the spiral groove is 1.25 times the spiral groove pitch P.

2. The spiral crimping tool for preparing annular threaded metal sleeves according to claim 1, characterized in that: The helical thread pitch P is 1.5 mm to 2.5 mm larger than the annular thread metal sleeve pitch P1.

3. The spiral crimping tool for preparing annular threaded metal sleeves according to claim 1, characterized in that: The formula for calculating the helix angle α of the annular threaded metal sheath is: α = arctan(1.25P / L); Where P is the spiral groove pitch and L is the length of the spiral groove.

4. A riveting mill for preparing annular threaded metal sleeves, characterized in that: include: The tool holder for embossing tools; The spiral embossing cutter according to any one of claims 1 to 3 is mounted on the embossing cutter holder; The tilt angle of the embossing tool holder is adjustable.

5. The rolling mill for preparing annular threaded metal sleeves according to claim 4, characterized in that: The pitch P2 of the embossing mill is 3.5mm to 4.5mm smaller than the pitch P of the spiral embossing.

6. The rolling mill for preparing annular threaded metal sleeves according to claim 4, characterized in that: The tilt angle of the grooved tool holder is 1~1.5° greater than the helix angle α of the annular threaded metal sheath.

7. The rolling mill for preparing annular threaded metal sleeves according to claim 4, characterized in that: The embossing tool holder is tilted to the left.

8. The rolling mill for preparing annular threaded metal sleeves according to claim 7, characterized in that: The texturing tool holder includes a tool holder body, a fixing component, and an adjusting component; the tool holder body and the fixing component are movably connected through the adjusting component; the adjusting component includes a lever seat and a connecting component; the lever seat has an arc-shaped slot; the connecting component is inserted into the arc-shaped slot to connect the lever seat and the fixing component; the tool holder body is connected to the lever seat.

9. The rolling mill for preparing annular threaded metal sleeves according to claim 8, characterized in that: There are two adjustment components, which are symmetrically arranged on both sides of the embossing tool holder.

10. The rolling mill for preparing annular threaded metal sleeves according to claim 9, characterized in that: The outer side of the lever holder is marked with graduations.

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